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A four-port wideband filtering monopole MIMO array for sub-6 GHz 5G communications

Published online by Cambridge University Press:  21 April 2023

Jasmine Vijithra Ayyappan Open the ORCID record for Jasmine Vijithra Ayyappan [Opens in a new window] ,
Gulam Nabi Alsath Mohammed  and
Sangeetha Subbaraj Open the ORCID record for Sangeetha Subbaraj [Opens in a new window]
Jasmine Vijithra Ayyappan*
Affiliation:
Department of Electronics and Communication Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam 603110, Chennai, Tamilnadu, India
Gulam Nabi Alsath Mohammed
Affiliation:
Department of Electronics and Communication Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam 603110, Chennai, Tamilnadu, India School of Electronics Engineering, Vellore Institute of Technology, Vellore 632014, India
Sangeetha Subbaraj
Affiliation:
School of Electronics Engineering, Vellore Institute of Technology, Vellore 632014, India
*
Corresponding author: Jasmine Vijithra Ayyappan, E-mail: jasminevijithraa@ssn.edu.in
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Abstract

This communication presents the significance of a four-port 2×2 multiple input multiple output antenna operating in mid-band frequency for 5G handheld device application. A microstrip-fed reference truncated decagonal monopole antenna operating at 3.9 GHz and a modified split-ring resonator (SRR)-based low-pass filter that excites at a cut-off frequency of 6.5 GHz are designed. On introducing a stub line in the SRR structure, the proposed filter shows a good out-of-band rejection beyond 6.5 GHz. By integrating the filter into the reference monopole, a wideband filtering monopole with improved stopband performance is obtained. A four-port MIMO array is constructed by orthogonally positioning the antenna with a center-to-center separation of 0.25λ0. To improve isolation, a pair of inverted L-stubs of varying lengths is introduced. The closed loop formed by the interconnection of stubs enhances isolation within the frequency range of 3–3.5 GHz. The fabricated prototype fosters an impedance bandwidth of 66.67%, isolation >18.5 dB, an average suppression of 15 dB, an average peak gain >3.7 dB, envelope correlation coefficient < 0.015, Actual Diversity Gain (ADG) > 9.9 dB, Effective Diversity Gain (EDG) > 8.8 dB, and efficiency >88%. The proposed design is suitable for 5G sub-6 GHz applications such as n48, n77, n78, n79 bands, WiMAX, and LTE bands 42, 43, 46, 47, 48.

Keywords

Isolationmodified split ring resonatormonopole antennastopband characteristicsstub lineswideband filtering
Type
Antenna Design, Modelling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 9 , November 2023 , pp. 1620 - 1629
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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